US8339660B2 - Tandem continuous paper printer - Google Patents
Tandem continuous paper printer Download PDFInfo
- Publication number
- US8339660B2 US8339660B2 US11/205,033 US20503305A US8339660B2 US 8339660 B2 US8339660 B2 US 8339660B2 US 20503305 A US20503305 A US 20503305A US 8339660 B2 US8339660 B2 US 8339660B2
- Authority
- US
- United States
- Prior art keywords
- tandem
- paper
- printer
- printer engine
- printing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/60—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material
Definitions
- the invention relates to a tandem continuous paper printer, wherein continuous paper printers are connected in tandem to perform duplex printing.
- tandem continuous paper printer wherein two continuous paper printers (a first printer engine and a second printer engine) are connected in tandem to realize duplex printing.
- tandem continuous paper printer As a related art of a tandem continuous paper printer, there is known a tandem continuous paper printer, wherein, in order to make a second printer engine perform synchronized printing on a page printed on by a first printer engine, a mark is printed on the first page by the first printer engine and the second printer engine starts printing upon detecting this mark (see, for example, JP-A-7-237336).
- the printing start positions of the two engines can be synchronized in regard to the first page of a print job.
- the maintenance of the page relationship among the two printer engines is aimed at by the continuation of normal printing by the two printer engines.
- a mark is printed by a continuous paper printer (see, for example, JP-A-2003-255635).
- the mark printed by this continuous paper printer is for “indicating a page partition for the starting of printing by a continuous paper printer that uses paper without perforations.”
- the page head can be matched for the first page on which printing is started when using the paper without perforations.
- this arrangement is not used for checking whether or not the front and back of each page are matched, is furthermore described in regard to a continuous paper printer engine, and there are no descriptions concerning relationships with a printer controller.
- the synchronization may deviate during execution of printing using the two printer engines, that is, a deviation in regard to the paper length may arise between the two printer engines and consequently, the page relationship among the two printer engines may deviate.
- the printing by one of the printers is stopped due to some cause.
- a printer engine stops at a page partition (perforations, etc.).
- a printer engine stops immediately at the point at which the error occurs, it may not necessarily stop at a page partition (perforations, etc.).
- the relationship between a page printed by the first printer engine and the page printed by the second printer engine is deviated may be obtained by the tandem continuous paper printer described in JP-A-7-237336. In this case, a user has to check all pages visually for whether or not the printed matter has been output with the page relationship being deviant.
- a tandem continuous paper printer including: a first printer engine; a second printer engine; and a printer controller. Tandem printing is performed by using the second printer engine on paper that has been printed on by the first printer engine.
- the first printer engine apart from performing printing of print data that make up a print job, performs printing of a tandem check mark on the paper at each page interval called “a check page interval S”.
- the second printer engine has a sensor detecting the tandem check mark. Whether or not the tandem check mark printed by the first printer engine is recognized at the check page interval S is checked by using the sensor, when printing of the respective pages by the second printer engine is performed.
- the second printer engine continues with the printing of the print data, if the tandem check mark is recognized by the sensor.
- the printing of the print data is stopped, if the tandem check mark is not recognized by the sensor.
- the printer controller executes error recovery printing after the printing is stopped.
- the tandem continuous paper printer performs a tandem duplex print mode, in which, after the first printer engine performs printing on a front surface of a paper, the paper is inverted and then supplied to the second printer engine, and the second printer engine performs printing on a back surface of the inverted paper.
- a sensor installed at the second printer engine to detect marks on the back surface side of the inverted paper, is used to recognize the tandem check marks.
- the tandem continuous paper printer performs a tandem single-side print mode, in which, after the first printer engine performs printing on a front surface of a paper, the paper is supplied as it is without being inverted to the second printer engine and the second printer engine performs printing on the front surface of the paper.
- a sensor installed at the second printer engine to detect marks on the front surface side of the paper, is used to recognize the tandem check marks.
- the first printer engine and the second printer engine are electrophotographic printer engines equipped at least with an imaging drum and a fixing unit.
- the check page interval S is of a length corresponding to a recovery length for a paper interval, for which fixing by the fixing unit is not guaranteed when an emergency stop error occurs at a printer engine.
- the check page interval S is an integral multiple of the paper length.
- each page in a print job is managed by a page serial number of a single page unit.
- the page serial number is counted beyond each individual print job and across a plurality of print jobs.
- Management of a check page interval S is performed using the page serial number.
- the check page interval S is set to a length corresponding to half a recovery length for a paper interval, for which fixing by the fixing unit is not guaranteed when an emergency stop error occurs at a printer engine.
- each pattern in a plurality of pattern series is repeated in order and used as the tandem check pattern.
- the printer controller executes error recovery printing after the printing is stopped.
- the tandem continuous paper printer has a tandem duplex print mode, in which, after the first printer engine performs printing on a front surface of a paper, the paper is inverted and then supplied to the second printer engine, and the second printer engine performs printing on a back surface of the inverted paper.
- a sensor installed at the second printer engine to detect marks on the back surface side of the inverted paper, is used to recognize the tandem check marks.
- the tandem continuous paper printer has a tandem single-side print mode, in which, after the first printer engine performs printing on a front surface of a paper, the paper is supplied as it is without being inverted to the second printer engine and the second printer engine performs printing on the front surface of the paper.
- a sensor installed at the second printer engine to detect marks on the front surface side of the paper, is used to recognize the tandem check marks.
- the first printer engine and the second printer engine are electrophotographic printer engines equipped at least with an imaging drum and a fixing unit.
- the check page interval S is of a length corresponding to a recovery length for a paper interval, for which fixing by the fixing unit is not guaranteed when an emergency stop error occurs at a printer engine.
- the check page interval S is an integral multiple of the paper length.
- the paper has a page serial number of a single page unit.
- the page serial number is counted beyond each individual print job and across a plurality of print jobs. Management of a fixed page interval is performed using the page serial number.
- the check page interval S is set to a length corresponding to half a recovery length for a paper interval, for which fixing by the fixing unit is not guaranteed when an emergency stop error occurs at a printer engine.
- each of the plurality of pattern series includes a plurality of element marks.
- each of the plurality of pattern series comprises a plurality of element marks.
- the number of element marks is counted each time a tandem check pattern is recognized. Whether or not the printed tandem check mark is recognized correctly is judged based on the counted number of element marks.
- each of the plurality of pattern series comprises a plurality of element marks.
- Each element mark expresses a binary value so that each pattern expresses a numerical value.
- the element marks are recognized numerically as a binary number of plural digits. Whether or not the printed tandem check pattern is recognized correctly is judged based on the recognized numerical value.
- the check page interval S is a random interval.
- a tandem continuous paper printer including: a first printer engine; a second printer engine; and a printer controller. Tandem printing is performed by using the second printer engine on a paper that has been printed on by the first printer engine.
- the first printer engine apart from performing printing of print data that make up a print job, performs printing of a tandem check mark on the paper at each check page interval S.
- the second printer engine has a sensor detecting the tandem check mark. In performing the printing of each page, the second printer engine checks, by the sensor, whether or not the tandem check mark printed by the first printer engine exists at each check page interval S. If the tandem check mark is detected, the second printer engine continues with the printing of the print data while if the tandem check mark is not detected, the printing is stopped.
- the printer controller executes error recovery printing after the printing is stopped.
- the tandem continuous paper printer has a tandem duplex print mode, in which, after the first printer engine performs printing on a front surface of a paper, the paper is inverted and then supplied to the second printer engine, and the second printer engine performs printing on a back surface of the inverted paper.
- a sensor installed at the second printer engine to detect marks on the back surface side of the inverted paper, is used to detect the tandem check marks.
- the tandem continuous paper printer performs having a tandem single-side print mode, in which, after the first printer engine performs printing on a front surface of a paper, the paper is supplied as it is without being inverted to the second printer engine and the second printer engine performs printing on the front surface of the paper.
- a sensor installed at the second printer engine to detect marks on the front surface side of the paper, is used to detect the tandem check marks.
- the first printer engine and the second printer engine are electrophotographic printer engines equipped at least with an imaging drum and a fixing unit.
- the check page interval S is of a length corresponding to a recovery length for a paper interval, for which fixing by the fixing unit is not guaranteed when an emergency stop error occurs at a printer engine.
- the check page interval S is an integral multiple of the paper length.
- the paper has a page serial number of a single page unit.
- the page serial number is counted beyond each individual print job and across a plurality of print jobs. Management of a check page interval S is performed using the page serial number.
- the check page interval S is set to a length corresponding to half a recovery length for a paper interval, for which fixing by the fixing unit is not guaranteed when an emergency stop error occurs at a printer engine.
- the first printer engine printing tandem check marks at check page intervals and the second printer engine checking whether or not the tandem check marks are recognized, whether or not there is mismatching of the page relationship of the printing by the first printer engine and the printing by the second printer engine can be verified.
- the reliability of the tandem printing system can thus be increased.
- FIG. 1 shows a diagram for describing the overall arrangement of a tandem continuous paper printer according to a first embodiment of the invention.
- FIG. 2 shows a diagram for describing the circumstances of printing onto paper by the tandem continuous paper printer.
- FIG. 3 shows a diagram for describing tandem check marks, etc.
- FIG. 4 shows a diagram for describing the arrangement of a printer controller.
- FIG. 5 shows a diagram showing an example of the results of printing onto paper.
- FIG. 6 shows a diagram for describing the processing procedure of a drawing unit.
- FIGS. 7A-7C show diagrams for describing the processing procedures of a printing control unit.
- FIG. 8 shows a diagram for describing the processing procedure for a tandem relationship mismatch error.
- FIG. 9 shows a hardware block diagram of the printer controller.
- FIG. 10 shows a diagram for describing the paper path of the tandem continuous paper printer.
- FIG. 11 shows a diagram for describing (a) the positioning of print data onto physical paper and (b) a physical page serial No. in a tandem duplex print mode and a tandem single-side print mode.
- FIG. 12 shows a diagram for describing (a) the positioning of print data onto physical paper and (b) a physical page serial No. in a tandem duplex print mode and a tandem single-side print mode.
- FIG. 13 shows a diagram for describing tandem check mark patterns of a second embodiment.
- FIG. 14 shows a diagram for describing the detection period and timing of the tandem check mark patterns of the second embodiment.
- FIG. 15 shows a diagram for describing tandem check mark patterns of a third embodiment.
- FIG. 16 shows a diagram for describing the detection period and timing of the tandem check mark patterns of the third embodiment.
- FIG. 17 shows a diagram for describing tandem check mark patterns of a fourth embodiment.
- FIG. 18 shows a diagram for describing the detection period and timing of the tandem check mark patterns of the fourth embodiment.
- FIG. 1 shows overall arrangement of the tandem continuous paper printer.
- a tandem continuous paper printer 100 mainly comprises a first printer engine 110 , a second printer engine 120 , and a printer controller 200 .
- the first printer engine 110 has a paper supply unit 111 , an imaging drum 112 , a fixing unit 113 , etc.
- a folded type continuous paper (referred to hereinafter as “paper”) is set in the paper supply unit 111 .
- the imaging drum 112 is used to execute imaging, transfer, and other electrophotography processes on the paper supplied from the paper supply unit 111 .
- a charging member which charges the imaging drum
- an exposure member which exposes the imaging drum surface
- a developing member which deposits toner and develops an image
- a transfer member which transfers the toner image onto the paper
- a cleaning member which cleans off the residual toner that remains without being transferred, etc.
- the toner image that has been transferred onto the paper is fixed onto the paper by use of the fixing unit 113 .
- a roll type paper can be supplied to the first printer engine 110 upon connection of a roll paper supply device (not shown).
- the second printer engine 120 has an imaging drum 122 , a fixing unit 123 , etc. Though the second printer engine 120 also has a paper supply unit as does the first printer engine, since this paper supply unit is not used in a tandem arrangement, it is omitted from the present FIGURE. In a below-described print mode other than the tandem mode, the paper supply unit is used at the second printer engine 120 as well.
- the functions of the respective units of the imaging drum 122 and fixing unit 123 are the same as those of the first printer engine 110 .
- the printer controller 200 receives print data from upper-level computers 130 , 131 , 132 , etc., and after carrying out a drawing process, outputs image data to the first printer engine 110 and the second printer engine 120 .
- the printer controller 200 is provided with a print mode setting unit 4610 that enables the setting of the print mode, such as the tandem duplex print mode.
- This print mode setting unit 4610 shall be described later using FIG. 4 .
- a paper inverting unit 150 In order to realize tandem printing using the first printer engine 110 and the second printer engine 120 , a paper inverting unit 150 , a paper inserting unit 121 , and a paper winding unit 160 are added.
- the computers 130 and 131 are connected to the printer controller 200 via a network 990 .
- the computer 132 is connected to the printer controller 200 via a local interface. Physically, the local interface is realized as a printer local I/F cable of FIG. 9 to be described later.
- the paper inverting unit 150 inverts a paper, on a first surface of which printing has been performed by the first printer engine 110 , and outputs the paper to the second printer engine 120 .
- the paper is passed as it is through the paper inverting unit 150 without being inverted.
- the second printer engine 120 receives the paper that has been conveyed through the paper inverting unit 150 from the paper inserting unit 121 and sends the paper to the paper winding unit 160 .
- the paper winding unit 160 winds up the paper supplied to the second printer engine 120 and supplies the paper to the electrophotography processes of the imaging drum 122 , etc., of the second printer engine 120 .
- the paper that has been printed on by the second printer engine 120 is output to a stacker unit 124 or a post-processing device 170 in accordance with the paper loading performed by an operator.
- the output to the post-processing device 170 is especially effective when a large-volume roll paper supply device is used as the paper of the first printer engine 110 .
- tandem duplex print mode The four print modes of the tandem duplex print mode, tandem single-side print mode, independent two-engine single-side print mode, and single-engine single-side print mode are prepared in the tandem continuous paper printer.
- the operator can set one of these modes using the print mode setting unit 4610 .
- the tandem duplex print mode and the tandem single-side print mode are modes in which printing is carried out by a tandem arrangement.
- Tandem single-side print mode can be called tandem simplex mode as an another term.
- the paper inverting unit 150 supplies the paper as it is without inversion to the second printer engine 120 .
- the second printer engine 120 also performs printing on the front surface of the paper. This mode is useful for spot color printing.
- the operations in the case of the independent two-engine single-side print mode and the single-engine single-side print mode shall be described later using FIG. 4 .
- tandem duplex print mode the tandem single-side print mode can also be realized in a similar manner.
- the paper is inverted by the paper inverting unit 150 and supplied to the second printer engine 120 .
- the second printer engine 120 performs printing on the back surface of the inverted paper using the imaging drum 122 , etc.
- the page that is printed is shifted by an inter-engine paper difference value ⁇ 220.
- the first printer engine 110 and the second printer engine 120 perform printing at a physical paper size unit to be described later using FIGS. 3 and 4 .
- the inter-engine paper difference value ⁇ 220 is thus counted using the number of pages of the physical paper size as the unit.
- Nf Nb+ ⁇ + 1 (Equation 1)
- the second printer engine 120 is provided with two mark sensors, that is, a first mark sensor 251 and a second mark sensor 252 .
- the first mark sensor 251 and the second mark sensor 252 are sensors for detecting tandem check marks printed by the first printer engine in the tandem duplex print mode and the tandem single-side print mode, respectively. By these detections, whether or not the tandem check marks are recognized at an appropriate timing and to be of the predetermined form is judged.
- the first mark sensor 251 may be used when the second printer engine 120 performs printing on the surface opposite the paper surface on which the first printer engine 110 has printed in the tandem duplex print mode.
- the second mark sensor 252 may be used when the second printer engine 120 performs printing on the same surface as the paper surface on which the first printer engine 110 has printed in the tandem single-side print mode.
- the tandem check marks 312 for checking the relationship of the first printer engine 110 and the second printer engine 120 in tandem printing may be described by FIG. 3 .
- FIG. 3 shows a paper schematically.
- the tandem check marks 312 are printed by the first printer engine 110 .
- Each tandem check mark 312 is printed at a position of length a in the paper feeding direction (vertical direction of FIG. 3 ) from a page partition of the continuous paper and of length b from the left end of the paper.
- a single pattern is used as a tandem check pattern. Examples of using a plurality of patterns are described as the second embodiment onwards.
- the values of “a” and “b” are determined by the physical position, etc., of the first mark sensor 251 and the second mark sensor 252 .
- arrangements are made so that favorable numerical values within the range of the paper can be set suitably for a and b by the operator from a user interface control unit 4600 and so that the tandem check marks will not overlap with other marks. It is especially important to enable a to be set freely.
- the printer controller 200 is provided with an upper-level interface unit 4100 , a drawing unit 4300 , a printing control unit 4500 , the user interface control unit 4600 , a first engine control unit 4551 , a second engine control unit 4552 , and an error processing unit 4700 as the respective processing units.
- the printer controller 200 is provided with a page buffer memory unit 4400 and a print mode 4710 .
- the upper-level interface unit 4100 shall be described first.
- the upper-level interface unit 4100 receives print data from the upper-level computers using various interfaces, such as the network, local interface.
- the print data take the form of a print command sequence, page description language, or other form that can be processed by the drawing unit 4300 .
- print command sequence and page description language include PostScript (registered trademark), PDF (Portable Document Format; registered trademark), and TIFF (Tagged Image File Format; registered trademark) of Adobe Systems Inc., PCL-5, PCL-5E, PCL-6, and PCL-XL (registered trademarks) of Hewlett-Packard Co., JPEG, etc.
- PostScript registered trademark
- PDF Portable Document Format
- TIFF Tagged Image File Format
- PCL-5, PCL-5E, PCL-6, and PCL-XL registered trademarks
- Ethernet registered trademark
- Token-Ring FDDI (Fiber Distributed Data Interface)
- ATM Asynchronous Transfer Mode
- ISDN Integrated Services Digital Network
- ADSL wireless LAN
- IEEE802.11a, IEEE802.11b, IEEE802.1g, etc. wireless LAN
- Bluetooth etc.
- Centronix As the local interface, Centronix, SCSI, fiber channel, IEEE1394, USB, RS-232C, RS-422/423, etc., are used.
- the drawing unit 4300 inputs the print data from the upper-level interface unit 4100 , performs drawing, that is, the dot expansion of each character element, graphics element, and image element that makes up the print data into a dot image format, writes and outputs the dot image data into the page buffer memory unit 4400 .
- the page buffer memory unit 4400 is arranged to store the dot image data for a plurality of pages.
- the paper size managed by the page buffer memory unit 4400 is set to the size of the paper handled by the first printer engine 110 and the second printer engine 120 . Since this paper size is the size of the actual physical paper, it shall also be referred to as the “physical paper size.” This paper shall also be referred to as the “physical paper.” Though the drawing unit 4300 processes the input print data and outputs the data in the dot image format, the paper size handled by the drawing unit 4300 is made independent of the physical paper size. That is, this paper size does not necessarily have to match the physical paper size. This paper size, which is prepared by the drawing unit 4300 in accordance with the print data, shall be referred to as the logical paper size. A document of the logical paper size is embedded and printed in the physical paper size.
- the post-processing device 170 is provided at a stage subsequent the second printer engine 120 , and here the logical paper size is cut out from the physical paper size to complete the printed matter.
- the N-up function to be described next, is effective.
- N logical paper pages are positioned within a physical paper page when the drawing unit 4300 performs drawing of the logical paper size within the physical paper size.
- the N of N-up is set to 2, 3, or 4, etc. are realized here, cases where N takes on other values can be realized in a similar manner.
- N 2 or 3
- the logical paper printing performance is thereby improved by two times and three times the performance of the mechanisms of the printer engines (the first printer engine and the second printer engine).
- This N-up function can be realized by making the physical paper size and the logical paper size independent of each other.
- the physical paper size is defined by the combination of the paper width 319 and the paper length 320 .
- the operator inputs this combination from the user interface control unit 4600 and registers it as the physical paper size.
- the region in which a printer engine can actually print is just within the broken-line area, and this region shall be referred to as the “printable region 311 .”
- the paper width within which printing can be actually be performed is thus 318 (printable paper width) of FIG. 3 .
- the printing control unit 4500 instructs the first engine control unit 4551 or the second engine control unit 4552 to read the dot image data of each page in the page buffer memory unit 4400 and output the data to the corresponding first printer engine 110 or the second printer engine 120 .
- the first engine control unit 4551 reads the dot image format data of the corresponding page in the page buffer memory unit 4400 and outputs the data to the first printer engine 110 . Consequently, the printing by the first printer engine 110 is performed.
- the second engine control unit 4552 reads the dot image format data of the corresponding page in the page buffer memory unit 4400 and outputs the data to the second printer engine 120 . Consequently, the printing by the second printer engine 120 is performed.
- the user interface control unit 4600 performs the receiving of inputs made by the operator from an input unit 920 , display of the states concerning the printer controller 200 , etc.
- the print mode setting unit 4610 is provided in the user interface control unit 4600 .
- the operator can select any among the tandem duplex print mode, the tandem single-side print mode, the independent two-engine single-side print mode, and the single-engine single-side print mode as the print mode 4710 of the tandem continuous paper printer 100 .
- tandem continuous paper printer 100 performs printing as was described using FIG. 2 .
- each of the first printer engine 110 and the second printer engine 120 performs single-side printing of separate print jobs independently of the other.
- the single-engine single-side print mode just the second printer engine 120 is used to perform single-side printing.
- the error processing unit 4700 executes individual error processes on respective errors detected by the printer controller 200 .
- the page buffer memory unit 4400 and the print mode 4710 are storage units. In order to clearly indicate that these are storage units, these are expressed using double lines as in FIG. 4 .
- the print mode 4710 is a portion for storing the print mode.
- the print mode that is set is stored in the print mode 4710 and processes are carried out in the printer controller 200 upon referencing the value in the print mode 4710 .
- FIGS. 5 to 8 a procedure for the checking of the page relationship among the two printer engines in the case where printing is performed with the two engines being connected in tandem shall now be described using FIGS. 5 to 8 .
- FIG. 5 illustrates the results of printing onto paper in this case.
- Nf Nb+ ⁇ +1.
- page S+1 page 13 ( 503 ) in the present example
- page S+2 page 14 ( 504 ) in the present example
- page 2 S+1 page 25 ( 505 ) in the present example
- page 2 S+2 page 26 ( 506 ) in the present example
- the drawing unit 4300 executes a PDL drawing 602 .
- each character element, graphics element, and image element that makes up the print data is dot expanded into a dot image format and written into the page buffer memory unit 4400 .
- the drawing unit 4300 prints the tandem check mark at each check page interval S.
- the tandem check mark is printed ( 605 ). If the page serial No. is not N ⁇ S+1, the tandem check mark is not printed ( 604 ).
- the page serial No. is a serial No. for a plurality of print jobs and is counted continuously from the turning on of the power of the tandem continuous paper printer 100 to the turning off of the power.
- the page serial No. is initialized to 1 when the power is turned on and is thereafter incremented with each page.
- a certain fixed value for example, page 65535 is exceeded, the page serial No. is returned to 1.
- a page is counted for each physical paper page that was described using FIGS. 3 and 4 .
- FIGS. 11 and 12 show (a) the positioning of the print data onto physical paper and (b) the physical page serial No. in the tandem duplex print mode and the tandem single-side print mode.
- FIG. 11 illustrates a 1UP case.
- A is for logical page 1 ( 1101 L- 1 )
- B is for logical page 2 ( 1101 L- 2 )
- C is for logical page 3 ( 1101 L- 3 )
- D is for logical page 4 ( 1101 L- 4 )
- E is for logical page 5 ( 1101 L- 5 ).
- L is for logical page 1 ( 1102 L- 1 )
- M is for logical page 2 ( 1102 L- 2 )
- N is for logical page 3 ( 1102 L- 3 ).
- the print contents (F 11 P- 8 ) of physical page serial No. 8 ( 11 P- 8 ) are printed.
- the print contents (F 11 P- 9 ) of physical page serial No. 9 ( 11 P- 9 ) are printed.
- FIG. 12 illustrates a 2UP case.
- A is for logical page 1 ( 1201 L- 1 )
- B is for logical page 2 ( 1201 L- 2 )
- C is for logical page 3 ( 1201 L- 3 )
- D is for logical page 4 ( 1201 L- 4 )
- E is for logical page 5 ( 1201 L- 5 ).
- the print contents (F 12 P- 1 ) of physical page serial No. 1 ( 12 P- 1 ), the print contents (F 12 P- 2 ) of physical page serial No. 2 ( 12 P- 2 ), the print contents (F 12 P- 3 ) of physical page serial No. 3 ( 12 P- 3 ), and the print contents (F 12 P- 4 ) of physical page serial No. 4 ( 12 P- 4 ) are printed.
- L is for logical page 1 ( 1202 L- 1 )
- M is for logical page 2 ( 1202 L- 2 )
- N is for logical page 3 ( 1202 L- 3 ).
- the print contents (F 12 P- 5 ) of physical page serial No. 5 ( 12 P- 5 ) and the print contents (F 12 P- 6 ) of physical page serial No. 6 ( 12 P- 6 ) are printed.
- the respective print contents (F 11 P- 6 , F 11 P- 10 , and F 12 P- 4 ) corresponding to physical pages 11 P- 6 , 11 P- 10 , and 12 P- 4 are blank.
- the print job data runs out at the odd-number page before each of these physical pages, since duplex printing is performed, the physical page corresponding to the opposite surface of each of these odd-number pages is printed as a blank page.
- each print job is printed starting with the first physical page to be printed having an odd physical page serial No. and ends with the last physical page to be printed having an even physical page serial No.
- the physical page serial No. of the physical page to be printed first takes on the value obtained by adding 1 to the physical serial No. of the last physical page of the previous print job and is an odd number. This print job also ends with the physical page that is printed last having an even physical page serial No.
- the processing procedure of the printing control unit 4500 shall now be described using FIGS. 7 and 8 .
- the printing control unit 4500 instructs that the contents of the page buffer memory unit 4400 , which were written for the respective pages by the drawing unit 4300 , be output successively to the printer engines. Specifically, if a print page is to be printed by the first printer engine ( 701 ), a first printer engine print instruction ( 710 ) is carried out. If a print page is to be printed by the second printer engine ( 702 ), a second printer engine print instruction ( 750 ) is carried out. With the first embodiment, that a print page is to be printed by the first printer engine is judged from the page serial number. Also, that a print page is to be printed by the second printer engine is judged from the page serial number being an even number. In addition, the page serial numbers are assigned from the top of the print job.
- a print instruction 712 is issued to the first printer engine 110 for each odd-number page ( 711 ).
- the second printer engine print instruction 750 the following processes are carried out for each even-number page ( 751 ).
- a second engine I/F adapter 982 is instructed to read the tandem check mark using the first mark sensor 251 or the second mark sensor 252 . Specifically, the instruction is carried out by setting the input/output signal of the second engine I/F adapter 982 , to be described below using FIG. 9 , as follows.
- tandem check mark positions, read 1 _position_a, read 1 _position_b, are set and thereafter the read instruction signal, read 1 _order, for the first mark sensor is asserted.
- tandem check mark positions, read 2 _position_a, read 2 _position_b, are set and thereafter the read instruction signal, read 2 _order, for the second mark sensor is asserted.
- the tandem check mark is recognized to be of the predetermined pattern at the input tandem check mark position, read 1 _position_a, read 1 _position_b.
- tandem check mark If the tandem check mark is not recognized correctly, that is, if the reading of the tandem check mark fails, the reading result, read 1 _result, of the tandem check mark by the first mark sensor is output as 0. In this case of failure to read the tandem check mark (read 1 _result is 0), it is deemed that a tandem relationship mismatch error has occurred ( 801 ) and the tandem relationship mismatch error process 810 , illustrated in FIG. 8 , is executed.
- the tandem check mark is recognized to be of the predetermined pattern at the input tandem check mark position, read 2 _position_a, read 2 _position_b.
- tandem check mark If the tandem check mark is not recognized correctly, that is, if the reading of the tandem check mark fails, the reading result, read 2 _result, of the tandem check mark by the second mark sensor is output as 0. In this case of failure to read the tandem check mark (read 2 _result is 0), it is deemed that a tandem relationship mismatch error has occurred ( 801 ) and the tandem relationship mismatch error process 810 , illustrated in FIG. 8 , is executed.
- the print instruction 712 and the print instruction 755 instruct, in regard to the page in the page buffer memory unit 4400 that is to be read, the reading of the contents of the page and the execution of printing by the printer engine in synchronization with the reading.
- tandem check mark read instruction 754 is issued at an appropriate timing in accordance with the printing speed (paper speed) and the paper length 320 .
- the tandem check mark read instruction 754 for the page serial No., N ⁇ S+2 may be issued as necessary at an earlier timing than when the page serial No. is N ⁇ S+2.
- the timing of the issuing of the tandem check mark read instruction 754 is determined in accordance with the paper length 320 .
- recovery lengths R shall be defined as follows.
- FIG. 10 is a diagram showing the paper path of the tandem continuous paper printer 100 of the first embodiment.
- the paper path from a print start point S 1 ( 1001 ) of the first printer engine 110 to a print start point S 2 ( 1002 ) of the second printer engine 120 is indicated by thick lines.
- the length of this path is the inter-engine paper difference value ⁇ ( 220 ).
- the print start point is also referred to as the transfer point.
- the paper interval, for which fixing by the fixing unit is not guaranteed when an emergency stop error occurs at the second printer engine 120 shall be the recovery length R 2 .
- the recovery length R 2 is the length of the paper path from a fixing point T 2 ( 1003 ) of the second printer to the print start point S 2 ( 1002 ) of the second printer.
- the recovery length R 1 is the length of the paper path between T 1 ( 1005 ) and S 1 ( 1001 ).
- the paper length 320 of each page printed by the tandem continuous paper printer shall be L.
- the recovery length R for the second printer engine 120 is the length indicated by the dotted line from the print start point S 2 ( 1002 ) to the fixing point T 2 ( 1003 ) of the second printer engine.
- check page interval S is set by the following methods.
- the check page interval S is set to the rounded down value of: recovery length R/paper length L.
- the check page interval S is set to the rounded down value of: recovery length R/(2 ⁇ paper length L).
- the tandem front/back relationship check is performed at each check page interval S. When a relationship mismatch is detected twice consecutively, it is deemed that a tandem front/back relationship mismatch error has occurred. When a relationship mismatch is detected just once, it is not deemed that the tandem front/back relationship mismatch error has occurred.
- Method 2 accommodates for cases where a detection error due to noise, etc., has occurred in regard to the first mark sensor 251 , the second mark sensor 252 , the first engine I/F adapter 981 , the second engine I/F adapter 982 , and cables associated with these, which are the hardware for reading the tandem check marks. That is, with Method 2, errors are accommodated by making use of the low probability of an error occurring twice consecutively.
- the check by Method 2 and the check by Method 1 are thus practically the same in the interval of finding a mismatch, which is the rounded down value of: recovery length R/paper length L.
- the recovery length R is set, for example, to approximately 80 inches.
- the check page interval S may be set to the value less than or equal to the value, which is calculated by Method 1 or Method 2. In this case is checked in shorter period and the tandem front/back relationship error mismatch can be detected earlier than in the case that the check page interval S is set to be the value calculated by Method 1 or Method 2.
- the selection of the first mark sensor and the second mark sensor is carried out as follows.
- the printing control unit 4500 uses the second engine control unit 4552 to instruct which mark sensor is to be used in accordance with whether the print mode 4710 is the tandem duplex print mode or the tandem single-side print mode. Once instructed, the same mark sensor is used until another instruction is made. In the case of the tandem duplex print mode, the use of the first mark sensor 251 is instructed. In the case of the tandem single-side print mode, the use of the second mark sensor 252 is instructed.
- tandem relationship mismatch error process 810 The details of the tandem relationship mismatch error process 810 shall now be described using FIG. 8 .
- the printing is stopped ( 811 ).
- the error code corresponding to the tandem relationship mismatch error and a message expressing the contents thereof are displayed on a display unit 940 ( 812 ).
- An individual error process is then instructed to the error processing unit 4700 ( 813 ).
- the error processing unit 4700 executes (1) the reporting of the error information to the upper-level computer 130 and (2) an error recovery printing.
- the error recovery printing is executed, for example, as follows.
- the expanded data stored in page buffer memory unit 4400 are used to perform printing of the pages from page 15 , which is the reprint starting page, onwards.
- the expanded dot image data stored in the page buffer memory unit 4400 for the physical pages corresponding to the total length of the inter-engine paper difference value ⁇ and the recovery length R are used to perform the error recovery printing.
- this error recovery printing first the stored expanded dot image data are used to perform printing by the first printer engine. Then after a lag of just the inter-engine paper difference value ⁇ , the printing by the second printer engine can be performed at the same time as the printing by the first printer engine.
- the positioning of the first mark sensor 251 and the second mark sensor 252 for reading the tandem check marks shown in FIG. 2 shall now be described based on the details described using FIG. 10 .
- the first mark sensor 251 and the second mark sensor 252 are positioned between the fixing point T 1 ( 1005 ) of the first printer engine and the transfer point S 2 ( 1002 ) of the second printer engine. These are preferably positioned before the exposure point (not shown) of the second printer engine.
- the sensors are positioned on the second printer engine at positions, located prior to the exposure point of the second printer engine and where there are spaces for installation of the sensors, as shown in FIG. 2 .
- the printer controller 200 comprises an MPU 900 , a system bus 901 , a ROM 910 , a RAM 911 , the input unit 920 , the display unit 940 , a disk controller 931 , a secondary storage device 932 , a network controller 950 , a local I/F adapter 980 , the first engine I/F adapter 981 , and the second engine I/F adapter 982 .
- the system bus 901 is a communication member for the various input/output signals (address signals, data signals, and other control signals) of the MPU 900 .
- the MPU 900 performs, via the system bus 901 , input and output with respect to peripheral devices, such as the secondary storage device 932 , the input unit 920 , the display unit 940 , and the network 990 , and memories, such as the ROM 910 and the RAM 911 .
- peripheral devices such as the secondary storage device 932 , the input unit 920 , the display unit 940 , and the network 990 , and memories, such as the ROM 910 and the RAM 911 .
- the secondary storage device 932 is connected to the system bus 901 via the disk controller 931 .
- the system bus 901 of this printer controller is connected via the network controller 950 to the network 990 , which is a LAN or WAN, etc.
- Ethernet registered trademark
- Token-Ring FDDI (Fiber Distributed Data Interface)
- ATM Asynchronous Transfer Mode
- ISDN Integrated Services Digital Network
- the local I/F adapter 980 is an adapter for directly connecting the printer controller 200 to the computer 132 .
- Centronix, SCSI, fiber channel, IEEE1394, USB, RS-232C, or RS-422/423, etc. is used as the interface with the computer and connection is made using printer local I/F adapter.
- the first engine I/F adapter 981 is an adapter for interfacing with the first printer engine 110 .
- a video interface is used as the interface between the first engine I/F adapter 981 and the first printer engine 110 .
- the second engine I/F adapter 982 is an adapter for interfacing with the second printer engine 120 .
- a video interface is used as the interface between the second engine I/F adapter 982 and the second printer engine 120 .
- An initial startup program (also referred to as the “IPL (Initial Program Loading) program”) for the printer controller 200 and a portion of character fonts are stored in the ROM 910 .
- the RAM 911 In the RAM 911 are stored (a) a control program for the printer controller, (b) the remainder of the character fonts, (c) various buffer memory contents, (d) various management tables, etc. Of these, (a) and (b) are stored by loading from the secondary storage device 932 in the IPL program. Also, (a) and (b) may be stored instead in advance in the ROM 910 and not stored in the RAM 911 . Or oppositely, all of the character fonts may be stored in the RAM 911 so that none of the character fonts are stored in the ROM 910 .
- the input unit 920 is used for the operator to make inputs into the printer controller 200 .
- a keyboard, mouse, switch, touch panel, etc., may be used as the input member.
- the display unit 940 is used for display of the states of printer controller and the setting values.
- a liquid crystal panel, CRT, or other type of panel or LED's, etc., may be used as the display member.
- the first engine I/F adapter 981 performs input/output processes with the first printer engine 110 in accordance with instructions of the MPU 900 .
- the second engine I/F adapter 982 performs input/output processes with the second printer engine 120 in accordance with instructions of the MPU 900 .
- the first engine I/F adapter 981 performs a process of reading the contents of the page buffer memory unit 4400 into the first printer engine 110 .
- the second engine I/F adapter 982 performs a process of reading the contents of the page buffer memory unit 4400 into the second printer engine 120 . These reading processes are carried out using a DMA (Direct Memory Access) function incorporated in each of the first engine I/F adapter 981 and the second engine I/F adapter 982 .
- DMA Direct Memory Access
- the first engine I/F adapter 981 asserts an interrupt signal (a portion of the bus signals for the MPU 900 ) with respect to the MPU 900 and makes the MPU 900 start a read-complete interrupt process of the page buffer memory unit 4400 .
- the second engine I/F adapter 982 asserts an interrupt signal (a portion of the bus signals for the MPU 900 ) with respect to the MPU 900 and makes the MPU 900 start the read-complete interrupt process of the page buffer memory unit 4400 .
- the page for which reading has been completed has become vacant and can be used for the drawing of the next page is set in the management table concerning the page buffer memory unit 4400 , and tasks of the drawing unit 4300 , etc., which are awaiting for the vacancy of the page inside page buffer memory unit 4400 , are released from the vacancy waiting state.
- the first engine I/F adapter 982 and the second engine I/F adapter 981 perform parallel/serial conversion to convert the dot image data that have been read to the serial format and then performs output to the first printer engine 110 or the second printer engine 120 using image transfer signals between the corresponding printer engine.
- the image transfer signals may be transferred as they are in the parallel format without performing parallel/serial conversion. Also if necessary, conversion from a compressed format to a non-compressed format may be performed prior to the parallel/serial conversion.
- the first engine I/F adapter 981 and the second engine I/F adapter 982 furthermore uses command transmitting and status receiving signals with the corresponding first printer engine 110 or the second printer engine 120 to perform inquiry or transmitting of a command for instruction to the first printer engine 110 or the second printer engine 120 and to receive response statuses from the first printer engine 110 or the second printer engine 120 .
- first engine I/F adapter 981 and the second engine I/F adapter 982 There are two methods of implementing the first engine I/F adapter 981 and the second engine I/F adapter 982 : a method of mounting sub-MPUs dedicated to the adapters and a method of not mounting sub-MPUs and making the necessary control processes be performed at the MPU 900 . Either can be used to realize the installation.
- the first printer engine 110 prints the tandem check marks 312 at fixed page intervals (check page intervals S), and printing by the second printer engine 120 checks for the existence of the tandem check marks 312 .
- FIGS. 13 and 14 A second embodiment shall now be described using FIGS. 13 and 14 .
- This second embodiment is a modification example of the first embodiment.
- the pattern shapes of the tandem check marks are made not all the same as in the first embodiment but a plurality of pattern shapes are repeated.
- the respective patterns in a pattern series of a plurality of pattern shapes are repeated in order and used as tandem check patterns.
- the problems of (1) and (2) are thereby resolved.
- tandem check marks 312 in FIG. 3 for example, each of the four pattern shapes ( 1301 , 1302 , 1303 , and 1304 ) shown in FIG. 13 is used as a tandem check pattern and these four patterns are used repeatedly.
- a first tandem check mark pattern 1301 , a second tandem check mark pattern 1302 , a third tandem check mark pattern 1303 , and a fourth tandem check mark pattern 1304 are formed of four, two, one, and three element marks, respectively.
- element marks refer, for example in the case of the first tandem check mark pattern, to the four black patterns ( 13011 , 13012 , 13013 , and 13014 ) that make up the tandem check mark pattern.
- the first tandem check mark pattern thus comprises four element marks.
- the second tandem check mark pattern comprises two element marks ( 13021 and 13022 ).
- the respective tandem check marks for example, the four element patterns 13011 , 13012 , 13013 , and 13014 making up the first tandem check mark pattern 1301 are positioned in that order in the paper conveying direction. These may instead be positioned in the reverse order, that is, in the order of 13014 , 13013 , 13012 , and 13011 in the paper conveying direction. Also, the four element patterns 13011 , 13012 , 13013 , and 13014 may be positioned in a direction orthogonal to the paper conveying direction.
- the same specifications as those of the first tandem check mark pattern 1301 applies to the other tandem check mark patterns, that is the second tandem check mark pattern 1302 , the third tandem check mark pattern 1303 , and the fourth tandem check mark pattern 1304 .
- the reading of the respective tandem check mark patterns is executed as follows in accordance with the tandem check mark read instruction 754 .
- the tandem check marks are detected using the first mark sensor or the second mark sensor.
- tandem check marks are recognized at an appropriate timing and to be of the predetermined pattern. Specifically, how many of the element marks, which make up each tandem check pattern, is detected within a tandem check mark detection period 1400 is counted. If the number of the counted element marks matches the predetermined number, it is deemed that the tandem check marks are recognized correctly, that is, the reading of the tandem check marks is successful. If the number of the counted element marks does not match the predetermined number, it is deemed that the tandem check marks are not recognized correctly, that is, the reading of the tandem check marks failed.
- tandem check marks In the description of the second embodiment onwards, the first tandem check mark pattern, the second tandem check mark pattern, the third tandem check mark pattern, and the fourth tandem check mark pattern may also be referred to as tandem check marks, as tandem check mark patterns or as tandem check patterns.
- tandem check mark patterns are repeated in the manner of: the first pattern, the second pattern, the third pattern, the fourth pattern, the first pattern, the second pattern, the third pattern, the fourth pattern . . .
- a check of whether or not the number of element marks are counted in the manner of 4, 2, 1, 3, 4, 2, 1, 3, . . . is performed in the reading of the tandem check mark pattern. If in the reading of a certain tandem check mark, element marks of a number that deviates from this repetition are counted, it is deemed that a tandem relationship mismatch error has been detected.
- the intervals between the element check marks that make up the respective tandem check mark patterns is not noted.
- the counting and the judgment of whether or not the counted number of element marks matches the predetermined number are performed at the second engine I/F adapter 982 .
- the same can also be realized by transferring the counting and the judgment to processes of the MPU 900 .
- This third embodiment is a modification example of the second embodiment.
- a plurality of pattern shapes are repeated as the pattern shapes of the tandem check marks as in the second embodiment, and each pattern shape is arranged as a binary code.
- the number of pattern shapes that can be identified as tandem check marks can be increased and the possibility of erroneous detection can be reduced further in comparison to the second embodiment.
- tandem check marks 312 in FIG. 3 for example, each of the four pattern shapes ( 1501 , 1502 , 1503 , and 1504 ) shown in FIG. 15 is used as a tandem check pattern and these four patterns are used repeatedly.
- each of a first tandem check mark pattern 1501 , a second tandem check mark pattern 1502 , a third tandem check mark pattern 1503 , and a fourth tandem check mark pattern 1504 is formed of a plurality (four in the case of FIG. 15 ) of element mark portions.
- the first tandem check mark pattern 1501 is made up of a first element mark portion 1501 - 1 , a second element mark portion 1501 - 2 , a third element mark portion 1501 - 3 , and a fourth element mark portion 1501 - 4 .
- a binary value is expressed by the existence or non-existence of element marks.
- 1501 - 1 expresses the 2 3 bit
- 1501 - 2 expresses the 2 2 bit
- 1501 - 3 expresses the 2 1 bit
- 1501 - 4 expresses the 2 0 bit.
- Each tandem check patterns thus expresses a binary number of plural digits.
- the same arrangement as that of the first tandem check mark pattern 1501 applies to the second tandem check mark pattern 1502 , the third tandem check mark pattern 1503 , and the fourth tandem check mark pattern 1504 .
- 1504 - 1 expresses the 2 3 bit
- 1504 - 2 expresses the 2 2 bit
- 1504 - 3 expresses the 2 1 bit
- 1504 - 4 expresses the 2 0 bit.
- the first tandem check mark pattern 1501 , the second tandem check mark pattern 1502 , the third tandem check mark pattern 1503 , and the fourth tandem check mark pattern 1504 express (1111), (0001), (0100), and (1011), respectively.
- the respective tandem check marks for example, the four element mark portions 1501 - 1 , 1501 - 2 , 1501 - 3 , and 1501 - 4 making up the first tandem check mark pattern 1501 are positioned in that order in the paper conveying direction. These may instead be positioned in the reverse order, that is, in the order of 1501 - 4 , 1501 - 3 , 1501 - 2 , and 1501 - 1 in the paper conveying direction. Also, the four element mark portions 1501 - 1 , 1501 - 2 , 1501 - 3 , and 1501 - 4 may be positioned in a direction orthogonal to the paper conveying direction.
- the same specifications as those of the first tandem check mark pattern 1501 applies to the other tandem check mark patterns, that is, the second tandem check mark pattern 1502 , the third tandem check mark pattern 1503 , and the fourth tandem check mark pattern 1504 .
- a tandem check mark detection period 1600 is divided into the intervals 1601 , 1602 , 1603 , and 1604 in correspondence with the number of bits making up the tandem check mark pattern and, in each interval, whether or not there is an element mark at the element mark portion of the corresponding each digit of the binary value pattern is detected.
- the existence/non-existence of the 2 3 bit is detected in the interval 1601
- the existence/non-existence of the 2 2 bit is detected in the interval 1602
- the existence/non-existence of the 2 1 bit is detected in the interval 1603
- the existence/non-existence of the 2 0 bit is detected in the interval 1604 .
- the binary numbers expressed by the respective tandem check patterns 1501 , 1502 , 1503 , and 1504 are thus recognized as numerical values. Whether or not these recognized numerical values are the predetermined numerical values is then judged.
- the recognition of the tandem check patterns as binary numbers and the judgment of whether or not the numerical values recognized are the predetermined numerical values are carried out by the second engine I/F adapter 982 .
- the same can be realized by transferring the recognition as binary numbers and the judgment to processes of the MPU 900 .
- a recognized numerical value matches the corresponding predetermined numerical value, it is deemed that the tandem check marks are recognized correctly, that is, the reading of the tandem check marks is successful. If the recognized numerical value does not match the predetermined numerical value, it is deemed that the tandem check marks are not recognized correctly, that is, the reading of the tandem check marks failed.
- tandem check mark patterns are repeated in the manner of: the first pattern, the second pattern, the third pattern, the fourth pattern, the first pattern, the second pattern, the third pattern, the fourth pattern . . .
- a check of whether or not the numerical values are read in the manner of (1111), (0001), (0100), (1011), (1111), (0001), (0100), (1011), . . . is performed in the reading of the tandem check pattern. If in the reading of a certain tandem check mark, a numerical value that deviates from this repetition is read, it is deemed that a tandem relationship mismatch error has been detected.
- FIGS. 17 and 18 A fourth embodiment shall now be described using FIGS. 17 and 18 .
- This embodiment is a modification example of the third embodiment.
- the (0001) of the second tandem check mark pattern 1502 and the (0100) of the third tandem check mark pattern 1503 cannot be distinguished readily by human vision.
- Each of the second tandem check mark pattern 1502 and the third tandem check mark pattern 1503 is made up of a single element mark (black pattern) and since this element mark is isolated, the difference in position cannot be distinguished readily by human vision.
- the element mark of the 2 3 bit is always printed as a start bit to enable the binary pattern that follows to be recognized readily even by human vision.
- tandem check marks 312 in FIG. 3 for example, the four pattern shapes ( 1701 , 1702 , 1703 , and 1704 ) shown in FIG. 17 are repeated.
- a three-bit numerical pattern is expressed by the respective pattern shapes of a first tandem check mark pattern 1701 , a second tandem check mark pattern 1702 , a third tandem check mark pattern 1703 , and a fourth tandem check mark pattern 1704 .
- 1701 , 1702 , 1703 , and 1704 express (111), (001), (100), and (011), respectively.
- each of the second tandem check mark pattern 1702 and the third tandem check mark pattern 1703 is made up of two element marks (black patterns).
- the two element marks of the second tandem check mark pattern 1702 are separated, the two element marks of the third tandem check mark pattern 1703 are adjacent each other. This difference can be readily distinguished by human vision.
- a tandem check mark detection period 1800 is divided into the intervals 1801 , 1802 , 1803 , and 1804 in correspondence with the number of bits making up the tandem check mark pattern and, in each interval, whether or not there is an element mark at the element mark portion making up each digit (including the start bit) of the binary value pattern is detected.
- the existence/non-existence of the start bit is detected in the interval 1801
- the existence/non-existence of the 2 2 bit is detected in the interval 1802
- the existence/non-existence of the 2 1 bit is detected in the interval 1803
- the existence/non-existence of the 2 0 bit is detected in the interval 1804 .
- tandem check mark patterns are repeated in the manner of: the first pattern, the second pattern, the third pattern, the fourth pattern, the first pattern, the second pattern, the third pattern, the fourth pattern . . .
- a check of whether or not the numerical values are read in the manner of (111), (001), (100), (011), (111), (001), (100), (011), . . . is performed in the reading of the tandem check mark pattern. If in the reading of a certain tandem check mark pattern, a numerical value that deviates from this repetition is read, it is deemed that a tandem relationship mismatch error has been detected.
- the recognition of the tandem check patterns as binary numbers and the judgment of whether or not the numerical values recognized are the predetermined numerical values are carried out by the second engine I/F adapter 982 .
- the same can be realized by transferring the recognition as binary numbers and the judgment to processes of the MPU 900 .
- the second embodiment, the third embodiment, and the fourth embodiment may be realized in the following manner as well:
- the types of pattern shapes are not restricted to four types and an arbitrary number of patterns may be repeated.
- a fifth embodiment shall now be described.
- This embodiment is a modification example of the first embodiment.
- the pattern shape of all tandem check marks is made the same pattern shape as in the first embodiment, the check page interval S is made random.
- the check page interval S is fixed, the following problems occur since the check cycle is repeated at that value:
- the above problems (1) and (2) are resolved by making the check page interval S random.
- the possibility of deviation by the check page interval S can be lessened by randomization.
- randomization enables a detection precision, equivalent to that obtained when the check page interval S is made long, to be obtained without making the check page interval S long.
- the random variable may be generated using, for example, the pseudo-random number function, rand( ), in C language.
- paper without sprocket holes can be used in this invention.
- the above-embodiments can be realized in the same manner regardless of whether paper with sprocket holes or paper without sprocket holes is used.
- the tandem check marks 312 are printed by the first printer engine 110 and these are read by the first mark sensor or the second mark sensor. Whether or not there is mismatching in the page relationship of the printing by the first printer engine 110 and the printing by the second printer engine 120 can thereby be verified.
- the printing mechanism of this invention is not limited to electrophotography and this invention can be applied to various other methods, such as inkjet methods.
- FIG. 1 [ FIG. 1 ]
Landscapes
- Printers Characterized By Their Purpose (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
- Counters In Electrophotography And Two-Sided Copying (AREA)
- Dot-Matrix Printers And Others (AREA)
Abstract
Description
Nf=Nb+δ+1 (Equation 1)
S2=S1+R (Equation 2)
In the above,
-
- 170 Post-processing device
- Network
[FIG. 2 ] - 110 First printer engine
- 120 Second printer engine
- 150 Paper inverting unit
- 220 Inter-engine paper difference value δ
- 251 First mark sensor
- 252 Second mark sensor
[FIG. 3 ] - 301 First page
- 302 (S+1)-th page
- 311 Printable region
- 312 Tandem check mark
- 318 Printable paper width
- 319 Paper width
- 320 Paper length
[FIG. 4 ] - Upper-level computer
- 110 First printer engine
- 120 Second printer engine
- 200 Printer controller
- 4100 Upper-level interface unit
- 4300 Drawing unit
- 4400 Page buffer memory unit
- 4500 Printing control unit
- 4551 First engine control unit
- 4552 Second engine control unit
- 4600 User interface control unit
- 4610 Print mode setting unit
- 4700 Error processing unit
- 4710 Print mode
[FIG. 5 ] -
Page 1 - Check
[FIG. 6 ] - Drawing unit
- 601 For each page
- 602 PDL drawing
- The page serial No. is N×S+1 (where N=0, 1, 2 . . . )
- 605 Draw mark.
[FIG. 7A ] - Printing control unit
- The print page is to be printed by
- 701 For the first printer engine
- 702 For the second printer engine
- 710 First printer engine print instruction
- 750 Second printer engine print instruction
[FIG. 7B ] - First printer
engine print instruction 710 - 711 For each odd-number page
- 712 Print instruction
[FIG. 7C ] - Second printer
engine print instruction 750 - 751 For each even-number page
- The page serial No. is N×S+1 (where N=0, 1, 2 . . . )
- 754 Instruct reading of the tandem check mark.
- 755 Print instruction
[FIG. 8 ] - 801 Generation of tandem relationship mismatch error
- 810 Tandem relationship mismatch error process
- 811 Stop printing.
- 812 Error display
- 813 Instruction to error processing unit.
[FIG. 9 ] - 901 System bus
- 910 ROM
- 911 RAM
- 920 Input unit
- 931 Disk controller
- 932 Secondary storage device
- 940 Display unit
- 950 Network controller
- 980 Local I/F adapter Printer local I/F cable
- 981 First engine I/Fadapter Printer engine video I/F cable
- 982 Second engine I/F adapter Printer engine video I/F cable
- 990 Network
[FIG. 10 ] - Recovery length R
- Inter-engine paper difference value δ
[FIG. 11 ] - In the 1UP case
- Logical page
- Print data for
print job 1 - Physical page serial No.
- Physical paper
- First printer engine
- Second printer engine
- Blank
- Logical page
- Print data for
print job 2 - Physical page serial No.
- Physical paper
- First printer engine
- Second printer engint
- Blank
[FIG. 12 ] - In the 2UP case
- Logical page
- Print data for
print job 1 - Physical page serial No.
- Physical paper
- First printer engine
- Second printer engine
- Blank
- Logical page
- Print data for
print job 2 - Physical page serial No.
- Physical paper
- First printer engine
- Second printer engine
- Blank
[FIG. 13 ] - 1301 First tandem check mark pattern
- 1302 Second tandem check mark pattern
- 1303 Third tandem check mark pattern
- 1304 Fourth tandem check mark pattern
[FIG. 14 ] - Count the number of element marks within the tandem check mark detection period.
- 1400 Tandem check mark detection period
[FIG. 15 ] - 1501 First tandem check mark pattern
- 1502 Second tandem check mark pattern
- 1503 Third tandem check mark pattern
- 1504 Fourth tandem check mark pattern
[FIG. 16 ] - Decode the series of element marks within the tandem check mark detection period.
- 1600 Tandem check mark detection period
[FIG. 17 ] - 1701 First tandem check mark pattern
- 1702 Second tandem check mark pattern
- 1703 Third tandem check mark pattern
- 1704 Fourth tandem check mark pattern
[FIG. 18 ] - Decode the series of element marks within the tandem check mark detection period.
- 1800 Tandem check mark detection period
Claims (32)
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPP2004-237945 | 2004-08-18 | ||
JP2004237945 | 2004-08-18 | ||
JP2005158419 | 2005-05-31 | ||
JPP2005-158419 | 2005-05-31 | ||
JP2005228313A JP2007008143A (en) | 2004-08-18 | 2005-08-05 | Tandem continuous paper printer |
JPP2005-228313 | 2005-08-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20060039015A1 US20060039015A1 (en) | 2006-02-23 |
US8339660B2 true US8339660B2 (en) | 2012-12-25 |
Family
ID=35909314
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/205,033 Expired - Fee Related US8339660B2 (en) | 2004-08-18 | 2005-08-17 | Tandem continuous paper printer |
Country Status (3)
Country | Link |
---|---|
US (1) | US8339660B2 (en) |
JP (1) | JP2007008143A (en) |
DE (1) | DE102005039127A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120093536A1 (en) * | 2010-10-13 | 2012-04-19 | Konica Minolta Business Technologies Inc. | Image forming system |
US8705098B2 (en) | 2010-09-08 | 2014-04-22 | Konica Minolta Business Technologies, Inc. | Preventing print delay due to transfer of data regarding image forming and to enhance productivity in an image forming system with a tandem configuration including a plurality of image forming apparatuses |
US10370214B2 (en) | 2017-05-31 | 2019-08-06 | Cryovac, Llc | Position control system and method |
US11675546B2 (en) | 2021-10-20 | 2023-06-13 | Kyocera Document Solutions, Inc. | Unified and decentralized machine interface for control of multi- printer systems |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8836964B2 (en) * | 2006-01-31 | 2014-09-16 | Bell And Howell, Llc | Queued error reconciliation in a document processing environment |
US7967407B2 (en) * | 2006-02-03 | 2011-06-28 | R.R. Donnelley | Use of a sense mark to control a printing system |
US8027045B2 (en) * | 2006-12-04 | 2011-09-27 | Xerox Corporation | System and method for mitigating printer clutching |
US8753026B2 (en) | 2007-06-29 | 2014-06-17 | R.R. Donnelley & Sons Company | Use of a sense mark to control a printing system |
US8099009B2 (en) * | 2008-05-23 | 2012-01-17 | Eastman Kodak Company | Method for print engine synchronization |
US8180242B2 (en) * | 2008-05-23 | 2012-05-15 | Eastman Kodak Company | Print engine synchronization system and apparatus |
US8000645B2 (en) * | 2008-05-29 | 2011-08-16 | Eastman Kodak Company | Print engine productivity module inverter |
JP5338156B2 (en) * | 2008-06-27 | 2013-11-13 | 株式会社リコー | Tandem continuous paper printer |
US9098903B2 (en) * | 2009-07-21 | 2015-08-04 | R.R. Donnelley & Sons Company | Systems and methods for detecting alignment errors |
JP5460278B2 (en) * | 2009-12-09 | 2014-04-02 | キヤノン株式会社 | Image processing apparatus, control method therefor, and program |
JP4979783B2 (en) * | 2010-02-26 | 2012-07-18 | キヤノン株式会社 | Printing apparatus and printing control method |
JP5454910B2 (en) * | 2010-03-08 | 2014-03-26 | 富士ゼロックス株式会社 | Image forming apparatus and program for controlling image forming apparatus |
JP2011207207A (en) * | 2010-03-12 | 2011-10-20 | Ricoh Co Ltd | Continuous paper double-sided printer and printing method |
JP5640643B2 (en) | 2010-10-26 | 2014-12-17 | コニカミノルタ株式会社 | Image forming system |
DE102011000296B3 (en) * | 2011-01-24 | 2012-05-24 | OCé PRINTING SYSTEMS GMBH | Printing system, particularly tandem printing system, comprises two printing devices, which are selectively operated in single-mode and twin-mode, where printing devices are control-technically connected with each other in twin-mode |
JP2012189722A (en) | 2011-03-09 | 2012-10-04 | Ricoh Co Ltd | Fixing device, image forming device and image forming method |
WO2013154575A1 (en) * | 2012-04-13 | 2013-10-17 | Hewlett-Packard Development Company, L.P. | Duplex printing |
JP5918172B2 (en) * | 2013-06-03 | 2016-05-18 | 京セラドキュメントソリューションズ株式会社 | Image forming system and image forming apparatus |
US8931874B1 (en) * | 2013-07-15 | 2015-01-13 | Eastman Kodak Company | Media-tracking system using marking heat source |
JP6395385B2 (en) * | 2014-01-24 | 2018-09-26 | キヤノン株式会社 | Print control apparatus, print control method, and program |
US10016979B1 (en) * | 2017-05-04 | 2018-07-10 | Hp Indigo B.V. | In-line printing |
CN110202962B (en) * | 2019-06-25 | 2021-06-18 | 深圳弘博智能数码设备有限公司 | Front-back registration detection method for digital printing machine |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07237336A (en) | 1994-01-10 | 1995-09-12 | Fujitsu Ltd | Both-sided printing device of continuous paper |
US6198896B1 (en) * | 1998-03-20 | 2001-03-06 | Fujisu Limited | Image formation apparatus capable of detecting and correcting positional offsets |
US20020015177A1 (en) * | 2000-08-03 | 2002-02-07 | Fujitsu Limited, Kawasaki, Japan | Print control method and tandem printing system |
US6501929B1 (en) | 1998-08-13 | 2002-12-31 | OCé PRINTING SYSTEMS GMBH | Printing system for printing a recording medium using two printers, and a method for operating such a printing system |
JP2003255635A (en) | 2002-03-01 | 2003-09-10 | Hitachi Printing Solutions Ltd | System and method for both-face printing |
US20040064278A1 (en) * | 2002-09-30 | 2004-04-01 | Robbins Sanford H. | Method and system for random sampling |
US20040165025A1 (en) * | 2002-11-29 | 2004-08-26 | Hitoshi Ishibashi | Alignment pattern detecting sensor, method of determining acceptance width of the alignment pattern detecting sensor, method of forming alignment pattern, and image forming apparatus |
US20050104950A1 (en) * | 2001-09-04 | 2005-05-19 | Samsung Electronics Co., Ltd. | Apparatus to control color registration and image density using a single mark and method using the same |
US7099029B2 (en) * | 2001-09-14 | 2006-08-29 | International Business Machines Corporation | Method for aligning two or more independent printing systems with a single control unit and intelligent print controllers |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001287421A (en) * | 2000-04-07 | 2001-10-16 | Hitachi Koki Co Ltd | Perfecting system for continuous form |
JP4013139B2 (en) * | 2002-01-11 | 2007-11-28 | リコープリンティングシステムズ株式会社 | Tandem printing system |
JP4041959B2 (en) * | 2002-08-09 | 2008-02-06 | リコープリンティングシステムズ株式会社 | Printing stop control method in printing system |
-
2005
- 2005-08-05 JP JP2005228313A patent/JP2007008143A/en active Pending
- 2005-08-17 US US11/205,033 patent/US8339660B2/en not_active Expired - Fee Related
- 2005-08-18 DE DE102005039127A patent/DE102005039127A1/en not_active Ceased
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07237336A (en) | 1994-01-10 | 1995-09-12 | Fujitsu Ltd | Both-sided printing device of continuous paper |
US6198896B1 (en) * | 1998-03-20 | 2001-03-06 | Fujisu Limited | Image formation apparatus capable of detecting and correcting positional offsets |
US6501929B1 (en) | 1998-08-13 | 2002-12-31 | OCé PRINTING SYSTEMS GMBH | Printing system for printing a recording medium using two printers, and a method for operating such a printing system |
US20020015177A1 (en) * | 2000-08-03 | 2002-02-07 | Fujitsu Limited, Kawasaki, Japan | Print control method and tandem printing system |
US20050104950A1 (en) * | 2001-09-04 | 2005-05-19 | Samsung Electronics Co., Ltd. | Apparatus to control color registration and image density using a single mark and method using the same |
US7099029B2 (en) * | 2001-09-14 | 2006-08-29 | International Business Machines Corporation | Method for aligning two or more independent printing systems with a single control unit and intelligent print controllers |
JP2003255635A (en) | 2002-03-01 | 2003-09-10 | Hitachi Printing Solutions Ltd | System and method for both-face printing |
US20040064278A1 (en) * | 2002-09-30 | 2004-04-01 | Robbins Sanford H. | Method and system for random sampling |
US20040165025A1 (en) * | 2002-11-29 | 2004-08-26 | Hitoshi Ishibashi | Alignment pattern detecting sensor, method of determining acceptance width of the alignment pattern detecting sensor, method of forming alignment pattern, and image forming apparatus |
Non-Patent Citations (1)
Title |
---|
European Search Report dated Apr. 13, 2012, with partial English-language translation. |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8705098B2 (en) | 2010-09-08 | 2014-04-22 | Konica Minolta Business Technologies, Inc. | Preventing print delay due to transfer of data regarding image forming and to enhance productivity in an image forming system with a tandem configuration including a plurality of image forming apparatuses |
US20120093536A1 (en) * | 2010-10-13 | 2012-04-19 | Konica Minolta Business Technologies Inc. | Image forming system |
US10370214B2 (en) | 2017-05-31 | 2019-08-06 | Cryovac, Llc | Position control system and method |
US11675546B2 (en) | 2021-10-20 | 2023-06-13 | Kyocera Document Solutions, Inc. | Unified and decentralized machine interface for control of multi- printer systems |
Also Published As
Publication number | Publication date |
---|---|
JP2007008143A (en) | 2007-01-18 |
DE102005039127A1 (en) | 2006-03-30 |
US20060039015A1 (en) | 2006-02-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8339660B2 (en) | Tandem continuous paper printer | |
US6504619B1 (en) | Print control apparatus with error recovery function and its print control method | |
US20030007180A1 (en) | Printing control method for long pages | |
US4992882A (en) | Printer | |
JPH05254185A (en) | Printer device | |
JP3044939B2 (en) | Page printer | |
US20030169435A1 (en) | Printer control apparatus, printer control method, and printer | |
KR20060116551A (en) | Apparatus and method for printing | |
US6192208B1 (en) | Printing apparatus, control method for the same, and computer-readable storage medium storing printing-apparatus control program | |
US6421138B1 (en) | Page allocation/deallocation procedure for a printer/copier with accessory media sheet handling apparatus | |
JPH11115280A (en) | Printer | |
JP2007168103A (en) | Printer and its recovery printing method | |
US5303335A (en) | Image forming apparatus | |
US20040130748A1 (en) | Data output apparatus and host apparatus | |
JP2001310538A (en) | Apparatus for printing | |
JP3226841B2 (en) | Printer device | |
JPH0659833A (en) | Printer in network environment | |
JPH0336071A (en) | Erroneous printing detection apparatus | |
JP3311969B2 (en) | Discharge position control method and apparatus in printing apparatus | |
JP2745514B2 (en) | Printer control device | |
JP3283744B2 (en) | Output system and data processing method | |
JPH079703A (en) | Printer | |
JPH0465262A (en) | Page printer | |
JP2982007B2 (en) | Display device | |
JPH01306249A (en) | Printer |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: RICOH PRINTING SYSTEMS, LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KAGEYAMA, SEIJI;AKAI, MUNEYOSHI;UDO, HIROSHI;AND OTHERS;SIGNING DATES FROM 20050412 TO 20050812;REEL/FRAME:016971/0862 Owner name: RICOH PRINTING SYSTEMS, LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KAGEYAMA, SEIJI;AKAI, MUNEYOSHI;UDO, HIROSHI;AND OTHERS;REEL/FRAME:016971/0862;SIGNING DATES FROM 20050412 TO 20050812 |
|
AS | Assignment |
Owner name: RICOH COMPANY, LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RICOH PRINTING SYSTEMS, LTD.;REEL/FRAME:022191/0001 Effective date: 20081226 Owner name: RICOH COMPANY, LTD.,JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RICOH PRINTING SYSTEMS, LTD.;REEL/FRAME:022191/0001 Effective date: 20081226 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20161225 |